. Economic entomology. Beneficial insects; Insect pests; Thysanura. ii6 ARACHNOIDEA. CASE network of fine threads of silk, in which they suspend themselves, M. Duges says that some of them are certainly carnivorous; but there are some, the green colour of whose intestines indicate a vegetable diet. The larvae, like those of all the others, have been proved to be six footed. He places the genus among the Trom- bidii; but its spinning qualities seem to show that its proper place is with Tetranychus, with which its other characters do not disagree. No. 20. Megamerus celer {Dug., Ann. Sc. Nat., 18
. Economic entomology. Beneficial insects; Insect pests; Thysanura. ii6 ARACHNOIDEA. CASE network of fine threads of silk, in which they suspend themselves, M. Duges says that some of them are certainly carnivorous; but there are some, the green colour of whose intestines indicate a vegetable diet. The larvae, like those of all the others, have been proved to be six footed. He places the genus among the Trom- bidii; but its spinning qualities seem to show that its proper place is with Tetranychus, with which its other characters do not disagree. No. 20. Megamerus celer {Dug., Ann. Sc. Nat., 1834).—20. Magnified figure of ditto. Species sedis. No. 21. Tetranychus? (Leptus) Americanus Copied from Mr. Riley s fiLfure. Tetranychus? AMERICANUS, young (Lep- tus americanus, Riley, Sixth Ann. Rep. Missouri, 52).—21. Magnified sketch of ditto, copied from Mr. Riley's woodcut. Mr. Riley states that this species is found along with Leptus irritans in North America, and that both are there called Jiggers, or harvest mites. They are red like their congeners. Our information regarding both is insufficient to enable us to fix their place. No, 22. Tetranychus? irritans, young (Leptus irritans, Riley, loc. cit. supra).— 23. Magnified sketch of ditto, copied from Mr. Riley's woodcut. This is the Jigger of the Mis- sissippi valleys, where it is ex- ceedingly irritating—whence its name. It acts as one of the representatives in that country of our Tetranychus (Leptus) au- tumnalis; but until the perfect insect is known its place must Trombidium (Leptus), irritans. Copied from Mr. Kp^ /^nr»iAofiircil Riley's figure. ^^ Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Murray, Andrew, 1812-1878. [London] Chapman and Hall
Size: 1484px × 1683px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondonchapmanandha
